Water Pump Impeller Repair Kit – Fits Yamaha 2 & 4-Stroke 50-115 HP (Replaces 6H3-W0078-02-00, 68V-W0078-00-00)
Water Pump Impeller Repair Kit – Fits Yamaha 2 & 4-Stroke 50-115 HP (Replaces 6H3-W0078-02-00, 68V-W0078-00-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Impeller Repair Kit – Fits Yamaha 2 & 4-Stroke 50-11...
Water Pump Impeller Repair Kit – Fits Yamaha 2 & 4-Stroke 50-115 HP (Replaces 6H3-W0078-02-00, 68V-W0078-00-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit with Housing is designed for a wide range of Yamaha outboard motors. It provides a reliable cooling system overhaul for 2-stroke models from 50 HP to 70 HP (1992–2003) and 4-stroke models from 75 HP to 115 HP (2002–2010).
It serves as a direct replacement for Yamaha OEM parts 6H3-W0078-02-00 and 68V-W0078-00-00, as well as aftermarket equivalents from Sierra, UanofCn, and GlückMarine.
- Installs in the lower unit (gearcase) to restore cooling system performance.
- Features a durable nylon housing and a neoprene impeller for longevity in marine environments.
- Includes the essential housing, impeller, gaskets, and hardware for a complete rebuild.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6H3-W0078-02-00 | For 2-Stroke Models |
| Yamaha | 68V-W0078-00-00 | For 4-Stroke Models |
| Yamaha | 68V-W0078-01-00 | For 4-Stroke Models (Superseded) |
| Sierra | 18-3466 | Equivalent for 2-Stroke |
| Sierra | 18-3461 | Equivalent for older 2-Stroke models |
| Sierra | 18-3442 / 18-3523 | Equivalent for 4-Stroke |
| UanofCn | 6H3W0078 | Equivalent for 2-Stroke |
| GlückMarine | 6H3W0078 | Equivalent for 2-Stroke |
| GlückMarine | 68VW0078 | Equivalent for 4-Stroke |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | T50 | 50 | 2-Stroke | 1997–2010 | 6H3-W0078-02-00 | Thrusters/High Thrust models |
| Yamaha | C60 | 60 | 2-Stroke | 1996–2001 | 6H3-W0078-02-00 | Commercial models |
| Yamaha | E60 | 60 | 2-Stroke | 1995–1996 | 6H3-W0078-02-00 | Enduro models |
| Yamaha | P60 | 60 | 2-Stroke | 1992–1999 | 6H3-W0078-02-00 | Pro models |
| Yamaha | T60 | 60 | 2-Stroke | 2003–2010 | 6H3-W0078-02-00 | Thrusters/High Thrust models |
| Yamaha | 70 | 70 | 2-Stroke | 1992–2003 | 6H3-W0078-02-00 | |
| Yamaha | C70 | 70 | 2-Stroke | 2000–2001 | 6H3-W0078-02-00 | Commercial models |
| Yamaha | 60F | 60 | 2-Stroke | 1997–2003 | 6H3-W0078-02-00 | |
| Yamaha | 70B | 70 | 2-Stroke | 1997–2003 | 6H3-W0078-02-00 |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F75 | 75 | 4-Stroke | 2002–2010 | 68V-W0078-00-00 | |
| Yamaha | F90 | 90 | 4-Stroke | 2002–2010 | 68V-W0078-00-00 | |
| Yamaha | F115 | 115 | 4-Stroke | 2002–2010 | 68V-W0078-00-00 | |
| Yamaha | F115 | 115 | 4-Stroke | 2002–2010 | 68V-W0078-01-00 | Updated version |
| Yamaha | LF115 | 115 | 4-Stroke | 2002–2010 | 68V-W0078-00-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit with Housing
- Installation
- Lower Unit / Gearcase
- Housing Material
- Nylon PA66 / Plastic
- Housing Color
- Black
- Impeller Material
- Neoprene / CR-Neoprene
- Insert Cup Material
- SS316 Stainless Steel
- Wear Plate Material
- SS316 Stainless Steel
What’s in the Box
For Yamaha 2-Stroke Models (Kit 6H3-W0078-02-00)
- 1 x Water Pump Housing (6H3-44311-00-00)
- 1 x Impeller (6H2-44352-00-00)
- 1 x Insert Cup (663-44322-00-00)
- 1 x Water Pump Gasket (688-44316-01-00/688-44316-A0-00)
- 1 x Water Pump Gasket (6H2-44315-00-00/6H2-44315-A0-00)
- 1 x Outer Plate Gasket (6H2-44324-00-00/6H2-44324-A0-00)
- 1 x Wear Plate (6H3-44323-00-00)
- 1 x Impeller Key (90280-03M03-00/90280-03M07-00)
- 1 x O-Ring (93210-46044-00)
- 2 x Bolt with washer (90119-08M14-00)
- 2 x Bolt with washer (90119-08M33-00)
For Yamaha 4-Stroke Models (Kit 68V-W0078-00-00)
- 1 x Water Pump Impeller (18-3071/6E5-44352)
- 1 x Water Pump Housing (61A-44311-00/61A-44311-01)
- 1 x Insert Cup (18-3519/61A-44322)
- 1 x Wear Plate (18-3521/68V-44323)
- 1 x Gasket (18-0244/6E5-44315)
- 2 x Dowel Pins (93606-12019)
- 4 x Bolts (18-0256/91290-08045)
- 1 x Impeller Key (18-3302/90280-04M05)
- 1 x O-Ring (18-7483/93210-37M67)
- 1 x O-Ring (18-7485/93210-86M38)
- 4 x Washers (90209-08M02)
Installation Notes
- Disconnect the battery and shift linkage.
- Remove the bolts securing the lower unit (gearcase) to the upper casing.
- Carefully lower and remove the gearcase from the driveshaft housing.
- Unbolt and remove the old water pump housing assembly. Note the orientation of the old parts.
- Clean all mating surfaces thoroughly, removing any old gasket material or debris.
- Install the new wear plate, gaskets, and insert cup into the new housing.
- Apply a light coat of marine grease to the new impeller and install it, ensuring the keyway is aligned and the fins are oriented correctly (typically bent in a clockwise direction during installation).
- Bolt the new water pump assembly onto the gearcase, torquing bolts to manufacturer specifications.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
- Reconnect the shift linkage and battery. Test the engine with a reliable water source to confirm proper cooling and water flow from the telltale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
First, check the 'Engine & Model Compatibility' tables to find your model, HP, and year. Most importantly, verify the OEM Part Number listed for your model matches either 6H3-W0078-02-00 (2-Stroke) or 68V-W0078-00-00 (4-Stroke).
What are the signs of a failing water pump impeller?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent "telltale" water stream, a high temperature alarm sounding, or finding brittle, cracked, or melted pieces of the old impeller during an inspection.
How often should I replace my water pump impeller?
As a general guideline, inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval should be shorter if you operate primarily in saltwater or sandy/silty conditions.
Is it necessary to replace the housing and cup?
While not always required if they appear undamaged, replacing the housing, wear plate, and insert cup is highly recommended for a complete and reliable repair. A worn, scored, or melted housing can significantly reduce a new impeller's efficiency and lifespan. This kit includes all these components.
What’s the difference between the 2-stroke and 4-stroke kits?
They are designed for different engine series and are not interchangeable. They contain different components, part numbers, and housing designs (e.g., 6H3-series parts for 2-stroke vs. 68V-/61A--series for 4-stroke). Always order the kit that matches your engine's specific model and part number requirements.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency and quality.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most regions; expedited options will appear at checkout where available.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on a compatible list—do not order.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended for safety and optimal performance. Incorrect installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances, manufactured in certified facilities, and tested for real-world durability.
- Fast Global Fulfillment — With warehouses worldwide, we offer free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair, competitive pricing without compromising on materials or quality control.
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